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Measurement of the fraction of t(t)over-bar production via gluon-gluon fusion in p(p)over-bar collisions at root s=1.96 Tev

Author(s)
Xie, Si; Knuteson, Bruce O.; Henderson, C.; Hahn, Kristian Allan; Goncharov, Maxim; Gomez-Ceballos, Guillelmo; Choudalakis, Georgios; Makhoul, Khaldoun; Bauer, Gerry P; ... Show more Show less
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Abstract
We present a measurement of the ratio of the tt̅ production cross section via gluon-gluon fusion to the total tt̅ production cross section in pp̅ collisions at √s=1.96  TeV at the Tevatron. Using a data sample with an integrated luminosity of 955  pb[superscript -1] recorded by the CDF II detector at Fermilab, we select events based on the tt̅ decay to lepton+jets. Using an artificial neural network technique we discriminate between tt̅ events produced via qq̅ annihilation and gg fusion, and find Gf=σ(gg→tt̅ )/σ(pp̅ →tt̅ )<0.33 at the 68% confidence level. This result is combined with a previous measurement to obtain the most stringent measurement of this quantity by CDF to date, Gf=0.07[subscript -0.07][superscript +0.15].
Date issued
2009-02
URI
http://hdl.handle.net/1721.1/50641
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society
Citation
CDF Collaboration et al. “Measurement of the fraction of tt-bar production via gluon-gluon fusion in pp-bar collisions at s=1.96 TeV.” Physical Review D 79.3 (2009): 031101. c2010 American Physical Society.
Version: Final published version

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